169 



broken shell. All the three specimens are strongly flattened laterally, of conical shape, and 

 the basis strongly curved round the narrow sticks to which they are attached. The orifice 

 is medium-sized and distinctly toothed. They are beautifully coloured light red, and striped and 

 spotted with darker red. The radii are either quite white (those of the rostrum) or darker, 

 shading into darkish purple; their summits are oblique. 



Greatest diameter of the largest specimen, near the basis, 11.5 mm. 



lU/>. Stat. Makassar, May — June 1899, Depth 27 — 32 m. (Place and bottom not further indicated). 



Half a dozen beautifully coloured specimens, attached to pieces of corals and shells. 

 The colours are from light rose-red to purple in horizontal and in longitudinal stripes or patches. 

 Radii often white, in a few specimens red or even purple, summits slightly oblique. Orifice of 

 the shell large, elongately pentagonal, entire or indistinctly toothed. General shape of shell 

 cylindrical rather than conical. Largest diameter of the biggest specimen, near the basis, 

 about 1 1 mm. 



The scutum has the lines of growth not very prominent, and no beads along them. 

 Articular ridge very prominent, adductor ridge long, not very prominent. 



The tergum has the spur broad and rounded at the extremity. Growth-ridges not 

 prominent ; crests for the depressor muscles of unequal length and not prominent. 



Uk. Stat. Makassar, May — June 1899 (Place, depth and bottom not further indicated). 



A few larger specimens, greatest diameter of basis 14 mm., and several smaller ones, 

 all attached to shells of Gastropodous molluscs. Colour greyish-brown, with slightly darker 

 longitudinal bands. Shell conical. Orifice entire, in the smaller specimens superficially toothed, 

 rhombiform, with the rostral extremity rounded, and the carinal pointed. Radii with their 

 summits oblique. 



The scutum has narrow but rather prominent lines of growth, which are beaded in 

 an extremely delicate way, and which give the outer surface, when seen with a strong lens, 

 a longitudinally striated appearance. Adductor ridge very prominent. 



The tergum has the spur broad and rounded at the extremity. The longitudinal furrow 

 forms a shallow excavation, which is nearly as broad as the spur and terminates in a point 

 towards the apex. Crests for the depressor muscles moderately prominent. Carinal half of basal 

 margin nearly straight. 



IV. Stat. 109. July 5/6 1899. Anchorage of Pulu Tongkil, Sulu-archipelago. Depth 13 m. 

 Lithothamnium bottom. 



One small specimen, beautifully striped-red on a somewhat lighter ground, the stripes 

 running horizontally and longitudinally, and crossing each other. Radii triangular with oblique 

 summits, uniformly coloured red. Shell irregularly developed on a somewhat narrower basis. 

 Orifice moderately large, toothed. Two very small specimens were taken at the same place, and 

 probably belong to the same variety. 



This form probably corresponds to Darwin's var. (7) obscurus. 



41 



SIFOGA-EXPEDITIE XXXI b. 



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